Good day to all!
There are:
Model-Raspberry Pi 3 Model B Rev 1.2
Firmware Version-GoldenOrb_2017-12-15 () / LuCI branch (git-17.290.79498-d3f0685)
Kernel Version 4.4.92
There is a bunch: Iphone 5s (ttl 64) ---- wifi ----> raspberrypi (ttl 65) ----- lan (rg) ---> windows 10 (ttl 66)
How to change ttl in IP-packets on the Lede? That it was possible to put any ttl on Windows and on iphone always 64 came?
You can assign another TTL by DHCP, I'm not sure the client is required to use it. You can also assign TTLs to clients in their network config.
Editing a TTL in transit is not Best Practice and can break tools such as Traceroute. 64 hops is quite a lot to traverse the Internet; but behind a National Firewall, this limit may be too small.
Also, on OpenWrt:
cat /proc/sys/net/ipv4/ip_default_ttl
Shows the default TTL as 64. You can increase that too.